Condensing air-pump.



PATENTBD MAY 3, 1904.

J. WILHELMI.

CONDENSING AIR PUMP.

APPLICATION TILED MAY 2. 1903.

H0 MODEL.

me Non. runs u.. wommv.; warum n i Patented May 3, 1904.

JOHANNES WVILHELMI, OF HAMBURG, GERMANY.

CONDENSING AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. r758,801, dated May 3,1904.

Application filed May 2, 1903- Serial No. 155,432. (No model.)

Beit known that l, J ouANNns lVILnELMI, a resident of Hamburg, in theGerman Empire, have invented certain new and useful 1mprovements inCondensation Air-Pumps, of which the following is a specification.

The present invention relates to improvements in condensation air-pumps.

ln surface condensation it is advantageous to suck water and air fromthe condenser separately.

lV ith this end in View my invention consists in combining in a puip anair-piston presenting a large cross-section and a water-plunger pistonpresenting a small cross-section, both pistons being operated by onesingle pistonrod and arranged in such a manner that the space which isformed in the large cylinder between the large and the small pistoncauses by its vacuum action a compensation or balance of work betweenthe two halves of a double stroke (up and down stroke) and acts as abutler on the termination of the downstroke.

1n order that my invention may be more fully understood by one skilledin the art to which it appertains, l shall now proceed to describe thesame in det-ail, reference being taken for that'purpose to theaccompanying' sheet of drawing', whereon I have shown a central verticalsection of a condensation air-pump constructed in accordance with andembodying my invention.

The improved pump is provided with an aircylinder' ,'whieh is incommunication with the air-inlet by means of openings c and anannularychannel (l, surrounding the latter, and with the air-outlet c bymeans of suitable pressure-valves f, provided in the cylinder cover ortop wall g, and of a chamber or casing' It, mounted at the top of thepump and surrounding the said pressure-valves. At the lower part of thepump or cylinder (t there is arranged a water-c vlinder 1', which is incommunication, by means of openings/il and a chamber surrounding' thesaid openings, with the water-inlet m, and by means of a channel n and asuitable pressure-valve o with the wateroutlet p. The air-inlet I) andthe water-inlet ynf are suitably connected to the condenser.

The cylinder (l contains a piston q and the cylinder f' a piston fr,preferably a plunger-piston. Both pistons are attached to and operatedby a single piston-rods. 1n order to construct a pump of this kind ofsmall dimensions, the air-piston and the cylinder end walls g and taremade conical in form and the waterpiston and water-cylinder arranged inthe hollow of the conical piston z] and conical bottom wall t,respectively, as clearly shown in the drawing.

By means of the described arrangement of the condensation air-pump analmost uniform efliciency is obtained. During the upstroke the air abovethe piston q, which air opposes a comparatively small resistance, isexpelled through the valvesf, chamber lr., and outlet c againstatmospheric pressure, whereas fresh air is sucked into the spaceunderneath the piston q from the condenser through the openings e. Atthe end of the upstroke of the piston q the same vacuum will exist inthe cylinder a as in the condenser. As the piston Ir movessimultaneously with the piston r] a vacuum is produced at the same timein the water-cylinder J. lV hen at the end of the upstroke of thepistons q and r the bottom of the piston r has cleared the openings f,water will rush in from the condenser through the inlet m, chamber I,and openings 1 and fill up the water-cylinder a'. During the subsequentdownstroke of the pistons q and ll' the openings are immediately closedby the down movement of the piston fr, and the water below the piston r,which water opposes a comparatively great resistance, is forced outthrough the channel n, pressure-valve a, and outlet p, a vacuum beingproduced at the same time in the air-cylinder ay above the piston l] bythe down movement of this piston. Upon the termination of the downstrokethe lower part of vthe air-cylinder is completely closed by the piston qsliding over the openings c, and the air contained in the said lowerpart compressed, so that an extreme-ly advantageous cushioning effectfor compensating or absorbing the action of the weight of the movingparts is obtained. After the piston (1 on its downstroke has` passed theopenings c the vacuum above the piston q causes the air to rush from thecondenser through the cleared openings c into the air-cylinder, fromwhere it will be expelled by the next or following upstrole of theair-piston.

By the described combination of two pistons of different sizes thefollowing results are attained: Almost all the air is exhausted by thesucking action of the large piston and little or no air enters the smallwater-cylinder, and, secondly, a vacuum is formed or produced on eachstroke in the air-cylinder which demands an expenditure of energy on theupstroke of the piston which is, however, recuperated on the downstrole.

In the example shown the pistons operate with pressure-valves only, thesuction-valves being replaced by the openings c and and the slide actionof the pistons themselves. The pump may, however, `also be provided withsuction-valves, if desired. Then the pump is provided withsuction-valves, the conical chamber Z serves as suction air-chamber.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, is-

l. A pump having a water-cylinder and an air-cylinder larger than thewater-cylinder,

Y pistons therein, a piston-rod connected to both pistons and means toproduce an air-cushion at the termination of the downstroke, whereby thespace between the large and small pistons in the air-cylinder causes byits vacuum action a compensation or balance of work between the twohalves of a double stroke (up and down stroke), substantially asdescribed.

2. A pump having a water-cylinder and a concentric air-cylinder, eachhaving inletports,.concentric pistons in said cylinders, a piston-rodoperating both of the pistons, the ports. in the air-cylinder closedbefore the end of the air-piston stroke to form an air-cushion and admitair into the partial vacuum above the piston, and the ports in theWater-cylinder opened at the end of the suction-stroke of thewater-pistons to admit water to the partial vacuum formed in thewater-cylinder, substantially as described.

3. A pump having a water-cylinder provided with peripheral ports at oneend and a concentric air-cylinder provided with peripheral ports at itsopposite end, concentric pistons in said cylinders to control the portsand a piston-rod connected to both of the pistons, substantially asdescribed.

4. A pump having a water-cylinder provided with peripheral ports, aconcentric aircylinder also provided with peripheral ports, a conicalpiston in the air-cylinder and a piston in the water-cylinder eachcontrolling the respective ports, and a piston-rod connected to both ofthe pistons, substantially as described.

5. A pump having a water-cylinder provided with peripheral ports, aconcentric aircylinder having peripheral ports and conical ends, apiston in each of said cylinders controlling the respective ports and anannular conical chamber surrounding the water-cylinder and communicatingtherewith through the ports in said cylinder, substantially asdescribed.

6. A pump having a Water-cylinder provided with peripheral ports at itsupper end and having its lower end opening into a valvecontrolleddischarge-channel, a larger concentric air-cylinder having conical endsand peripheral ports near its lower end, an air-chamber surrounding theupper end of said cylinder, valves to'control the exhaust of Vair fromthe cylinder to the chamber, a conical piston in the air-cylinder, acylindrical piston in the water-cylinder, each controlling admissionthrough their respective ports and a conical chamber surrounding thewater-cylinder and communicating therewith through the ports rin saidcylinder, substantially as described.

JOHANNES WILHELMI.

Witnesses:

E. H. L. MUMMENHOFF, OTTO W. HELLMRICH.

